Hi i have a 2008 ninja 500r with anout 10800 miles on it. I was riding about 2 days ago and at a stop light, when the light turned green i gave it throttle but nothing happen. It would just idle. I pulled the bike over to the side and thought it needed fuel so i waited. Turned the bike on and rode it perfectly fine to a gas station. I was riding it today and i was accelerating out of 2nd gear into 3rd and my bike made a loud sound and got louder as the revs went up so i got onto the side of the road quickly and now the bike wont start. Ive already tried the battery. Now ot wont start. When i try to start it it sounds like it was to start but wont. Please help!

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Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else.
Was the new battery properly charged to begin with?
Loose battery connection?
I suppose the GPS could be too much but you said that it was dying last november, so I would suspect something else.
P.S. you need a properly charged battery to get an accurate reading for the charging test.

sounds like you killed the starter relay. If it takes a lot to start a bike eventually the contacts can weld themselves "open" causing the starter to continue cranking which would explain the sound you heard at the red light.

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hi ,
It sound to me like you may have a faulty plug or lead to your plugs .
Make sure all your spark plugs are the same as the previous ones .
Check all leads are also not loose or cracked as they may earth themselves and cause malfunction

The switch is the most likely source of the problem. Check it with a volt ohmmeter. Put the key in off and check the terminals. Next turn the key to the 1st position and check the terminals then on any further positions. The next time the bike self starts is when you want to re-check the switch terminals.

You know, this has all the signs of an internal short in the switch. Just tell the dealer to give you a new switch. Switch failure after 5 hours of riding is simply unacceptable.